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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
69
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.64g CO2 per view
FIX
1.64g CO2 per view
Warning::
1.64g CO2 per page view
This page transfers 6.9 MB, producing an estimated 1.64g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.26g.
Got: 1.64g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 196.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 196.4 kg of CO2 annually — equivalent to charging 24549 smartphones.
Info::
Green hosting reduces data center emissions

1.64g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 21% of websites

Sustainable Web Design model v4 · Page size: 6.9 MB

Your site
1.64g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.34g
End-user device
1.26g
At 10,000 monthly views: Monthly: 16.4 kg · Annual: 196.4 kg · ≈ 24549 smartphone charges
F
Carbon Budget
Action
79th percentile
FIX
79th percentile
Warning::
1.64g CO2 — above the median website (0.60g)
Heavier than an estimated 21% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 79th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.64g

79th percentile

Cleaner than 21% of websites

✗ Above the median website

vs Median 173% more
vs Target 227% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 841 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 841 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
88% efficient

Total waste: 841 KB (12% of page weight)

Unused JS 841 KB

0.19g unnecessary CO2 per visit

Actual transfer 7080 KB
Theoretical minimum 6239 KB
Potential savings 841 KB (0.19g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Netlify CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Next.js✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 85 KB (vs 7080 KB first visit). 191 of 192 resources are served from browser cache, saving 1.62g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.64g)
First visit
7080 KB
Repeat visit
85 KB

99% reduction on repeat visits

Saving 1.62g CO2 per returning visitor

191 resources served from cache · 1 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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